Method of sizing metal bands



A. W. LIMONT.

METHOD OF SIZING METAL BANDS.

APPLICATION FILED JUNE 28, 1918.

Patented June 28, 1921.

ALEXANDER W. LIMON T, OF BRIDGEPORT, CONNECTICUT, ASSIGN'OR TOBRIDGEPORT BRASS COMPANY, OF BRIDGEPORT, CONNECTICUT,

N'IECTIC'UT.

A CORPORATION 01E CON- METHOD 0] SIZING METAL BANDS.

jectile bands of copper or other soft, ductile metal, as set forth in myapplication,

Serial No. 149,875, filed February 20, 1917 (Patent No. -1,27 l,359,granted July 30., 1918) of which the present application is a division.

The primary object of the present invention is to provide an improvedmethod of bringing a roughly finished band accurately to the requireddimensions in a simple and economical manner. In the manufacture ofprojectile bands, the greatest accuracy is re quired and if there is theslightest deviation from the standard dimensions, the band is rejected.Any difliculty in this respect is overcome by practising myimprovedmethod, by which the bands can be very readily and quicklybrought to the required size and shape, the possibility of error beingreduced to a minimum.

To these and other ends, the invention consists in the novel steps andprocedure to be hereinafter described and claimed.

In the accompanying drawing, I have shown a vertical, central section ofa press adapted for the carrying on of my improved method. The pressshown in the drawing comprises a fixed mandrel 26 of cylindrical shaperisin from'a bed plate 27 the diameter of sai mandrel corresponding tothe internal diameter of the band to be formed.

Around the mandrel 26 is a die 28 hayinga cylindrical inner surfacecorresponding 1n diameter to the external diameter of the bandto beformed, the cylindrical inner sur face of the die facing and beinconcentric with the upper part of the man rel. A sizing sleeve 29 isadapted to slide up and down between the mandrel and die, said sleevebeing mounted on rods 30 supported by a plate 31, which plate 31 is, inturn, supported by rods 32 from the gate 33 of the Specification ofLetters Patent. Patented J 28 1921 Original application filed February20, 1917-, Serial No. 149,875. Divided June 28, 1918. Serial No.242,401.

and this application filed I press. The .main part of the sizing sleeve29 1s cyl ndrical in shape, its inner surface eonformlng snugly to theexterior surface of the mandrel. and its outer surface conform-- ingsnugly to the inner cylindrical surface of the die 28. The up er edgeof'said sizing sleeve is squared 0 preferably, so as to form a band witha squared off edge, and the upper part of the sleeve corresponds inlnterior and exterior diameter respectively with the band to be formed.Another sizing sleeve 34:, generally similar to the sleeve 29 and havingits lower cylindrical part of the same dimensions, is adapted to enterthe space between the mandrel and die when the gate is lowered.

The roughly finished cylindrical band, i

which is preferably formed in the manner set forth in my priorapplication, is placed around the mandrel, as shown at 10, and on thefirst part of the downward movement of thesleeve 29 down on to thesupport 27 and thereby perm t the blank to move down into the die. Whilein the die and around the the press, the plate 31 is lowered so as tolet spond inall its dimensions to the band which it is desired to form,it will be apparent that the roughly finished band will be perfected inshape and brought very accurately to the required dimensions. The bandmakes contact from top to bottom with the mandrel and the opposingsurface of the die.

en the proper pressure has been exerted and the required dimensionsobtained, the pressure on the blank is removed by raising the gate ofthe press with the sleeve 34. As the gate moves upward, it carries therods 32, plate 31 and pins 30, and this causes the lower sleeve to beraised sufliciently to move the finished hand up out of the die. In thismanner, the finished band is e ected from the die. It will be observed,from the drawin that the parts are so proportioned that w en the pressinof the blank commences, its upper sur ace is substantlally flush withthe upper surface of the die, and the upward movement of the band afterthe pressing operation is necessary to remove the band from the die andmandrel or facilitate such removal.

Various changes in the method herein described may be made a withoutdeparting from the scope of the invention as de ned in the claims.

I do not claim herein the illustrated mechanism for sizing metal bands,as the Same is claimed in my application, Serial No 277 ,662, filedFebruary 17, 1919.

What I claim is:

1. The method of sizing a projectile-band or the like of soft ductilemetal, which comprises interposing the same in the space between aconcentric die and mandrel, supporting the band from beneath in amovable manner so that it may be raised out of the die, exertingdownward pressure on the band while in the die to cause it to fill thespace between the mandrel and the die and bring it accurately to therequired size, then removing the pressure on the band, and finallejecting it from the die.

2. The method of sizing a metal band, which comprises placing the samein a suitable die and around a'mandrel, support ng the band in the diefrom beneath, exertlng ressure on the upper edge of the band while inthe die to cause it to contact from the top to bottom with the mandreland the die and bring it accurately to the required dimensions, thenremoving the pressure on the upper edge of the-band, and then exertingressure on the band from beneath to move 1t out of the die.

3. The method of sizing a metal projectile band, which comprises placingit 1n a suitable die around a'mandrel, supporting it from beneath by amember movable rela tively to the die and the mandrel, positioning saidmember so as to create a space of the required size between it and themandrel and the die, exerting pressure on the upper edge of the band todisplace the metal therea in and cause it to fill such space, andfinally lifting said movable member and thereby Ell e finished band toeject the latter from the 4. The method of sizing projectile bands andthe like, which comprlses placing the band in the space between aconcentric mandrel and die, supporting the band in said space frombeneath, and exerting pressure on the band from above to cause it tofill the space between the mandrel and the die, and

then raising the band to eject it from the die.

5. Themethod of sizing a projectile band or the like, which comprisesinterposing the roughly finished band in the space between a concentricmandrel and die with the band horizontally arranged, supporting it frombeneath so that its lower edge is substantially below the upper surfaceof the die and so as to leave'a s ace between the mandrel and the dieinw ich the band may be radially expanded, exerting pressure on the bandfrom above and forcing its up er edge down into the die to cause it tofill t e space betweenthe mandrel and the die, removing the pressure onthe band after the same has been accurately brought to size, and liftingthe finished band out of the die.

6. The method of sizing a projectile band or the like, which comprisessupporting it from beneath between a stationary man rel and die,exerting pressure on the band from above to cause it to contact from topto bottom with the mandrel, and then lifting the band to eject it fromthe die.

7 The method of sizing a projectile band of copper or like ductilemetal, which comprises supporting the same from beneath in the spacebetween a stationary concentric mandrel and die, exerting pressure onthe erting pressure on the band from above to cause it completely tofill the spacebetween the mandrel, die and means which supports the bandfrom below.

'9. The method of sizing a projectile band having cylindrical inner andouter surfaces and fiat edges, which com rises placing said band aroundan u stan ing mandrel and within a suitable die, supporting the bandfrom beneath to hold it in place between the mandrel and the die, thenpressing down against the upper edge of the band so as to cause theinner surface of the band to conform from top to bottom with the outersurface of the mandrel and the outer surface of the band to conform fromtop to bottom with the inner surface of the die, and then lifting theband to e'ect it from the die.

In witness whereo I have hereunto set my hand on the 24th da of June1918.

, ALEXAND R w. LIMONT.

